[특허]Method and apparatus for providing backup process control

Method and apparatus for providing backup process control 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06F-011/20 G06F-015/46
출원번호	US-0827920 (1992-01-29)
발명자 / 주소	Loftis Donald B. (Cleveland TN) Cawlfield David W. (Cleveland TN)
출원인 / 주소	Olin Corporation (Cheshire CT 02)
인용정보	피인용 횟수 : 47 인용 특허 : 0

초록 ▼

In a backup mode of operation a process control program sends messages, via a local area network, to a process control program running in an active mode for the purpose of obtaining current values of process control data and configuration information. If the active process control program fails to respond to an interrogation by the backup process control program the backup program automatically activates itself to assume the active role. The activation procedure includes a sequence that transmits a control pulse of predetermined width on a line of an associated process control bus to a novel digital data switch. The receipt of a valid control pulse causes the digital data switch to allow access by the backup (now active) data processor to process control I/O unit(s) while simultaneously isolating the active (now backup) data processor from the I/O units. If a response is received the backup processor receives and stores within a memory current process related data such that in the event the backup processor is required to assume the active processor functions the backup processor is fully cognizant of the current state of the process control environment. The switch may also include a watch dog timer for monitoring activity of at least one bus signal line associated with the active data processor for indicating an occurrence of a failure of the active data processor.

대표청구항 ▼

In a system having a plurality of data processors for controlling a resource, a method of controlling the resource comprising the steps of: a. communicating with the resource only from a first one of the data processors, the step of communicating including a step of transmitting data and receiving data through an active channel of a switch means, the switch means being coupled through a first communication path to the resource; b. periodically monitoring at the same time as the step of communicating with a second one of the data processors an activity of the first one of the data processors to determine if the first one of the data processors has stopped communicating with the resource, the step of monitoring occurring through a local area network second communication path coupled at least between the first one of the data processors and the second one of the data processors, the second one of the data processors being isolated from the resource; and c. if the step of monitoring indicates that the first one of the data processors has stopped communicating with the resource because of a detected control fault the method includes the further steps of i. independently having the second one of the data processors activate itself via a signal to the switch means such that the second one of the data processors is coupled to the active channel instead of the first one of the data processors; and ii. communicating with the resource only from the second one of the data processors, the step of communicating including a step of transmitting data and receiving data via the active channel of the switch means through the first communication path.

이 특허를 인용한 특허 (47)

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연합인증

Method and apparatus for providing backup process control 원문보기

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Method and apparatus for providing backup process control 원문보기

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